The ZigBee communications protocol for home area networks has attracted manufacturers. They include those who produce in-home energy consumption displays, communicating thermostats, energy control centers, and communicating chips inserted in appliances and other devices to manage energy use. However, customers who want to buy upgraded ZigBee equipment operating on the new 2.0 protocol that\u2019s capable of communicating through home wireless Internet routers will have to purchase a bridge to be able to communicate with their utility\u2019s smart meters, which operate on the 1.0 protocol. \u201cWe\u2019re not going to change the meters,\u201d San Diego Gas & Electric utility customer programs and projects manager Ted Reguly said, adding that he thinks bridges will have to be marketed for less than $100 to achieve commercial success with the utility\u2019s customers. So far Southern California Edison has certified five HAN devices that are compatible with its meters, according to David Jermain, utility principal manager for electric vehicle operations and home area network development . They are: -Rainforest Automation\u2019s and Aztech\u2019s in-home displays; -MMB Research\u2019s dongle, which is another term for a bridge device; and -Programmable, communicating thermostats made by Carrier and Energate, which will be available in retail stores. Rainforest\u2019s in-home display costs about $60, according to Tobin Richarson, ZigBee Alliance smart energy director. In Texas, he noted that in utility areas where the HAN function of meters is enabled customers already can buy the unit and set it up themselves without any utility involvement.